A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
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Austria, Germany's south-eastern neighbor
Explanation:
A fault is a product of brittle deformation in which a displacement occurs within the earth.
A normal and reverse fault both have an hanging wall and a foot wall.
- In a normal fault, the footwall moves upward and the hanging wall moves downward thereby causing extension.
- In a reverse fault, the footwall moves downward and the hanging wall moves upward thereby causing shortening.
- The footwall is the block on a side of the fault surface where a miner can stand whereas the hanging wall is the block on the other side.
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Fault brainly.com/question/8797749
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